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Semiflexible polymers characterized by the contour length $L$ and persistentlength $\ell_p$ confined in a spatial region $D$ have been described as aseries of ``{\em spherical blobs}'' and ``{\em deflecting lines}'' by de Gennesand Odjik for $\ell_p < D$ and $\ell_p \gg D$ respectively. Recently newintermediate regimes ({\em extended de Gennes} and {\em Gauss-de Gennes}) havebeen investigated by Tree {\em et al.} [Phys. Rev. Lett. {\bf 110}, 208103(2013)]. In this letter we derive scaling relations to characterize thesetransitions in terms of universal scaled fluctuations in $d$-dimension as afunction of $L,\ell_p$, and $D$, and show that the Gauss-de Gennes regime isabsent and extended de Gennes regime is vanishingly small for polymers confinedin a 2D strip. We validate our claim by extensive Brownian dynamics (BD)simulation which also reveals that the prefactor $A$ used to describe the chainextension in the Odjik limit is independent of physical dimension $d$ and isthe same as previously found by Yang {\em et al.}[Y. Yang, T. W. Burkhardt, G.Gompper, Phys. Rev. E {\bf 76}, 011804 (2007)]. Our studies are relevant foroptical maps of DNA stretched inside a nano-strip.

DNA confined in a two-dimensional strip geometry